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Primordial non-Guassianity in inflation with gravitationally enhanced friction

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arxiv 2210.05201 v2 pith:6HSPN73J submitted 2022-10-11 gr-qc

Li-Yang Chen , Hongwei Yu , Puxun Wu This is my paper · ORCID
classification gr-qc
keywords non-gaussianityenhancedfrictiongravitationallyinflationperturbationsprimordialcurvature
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abstract

The gravitationally enhanced friction can reduce the speed of the inflaton to realize an ultra-slow-roll inflation, which will amplify the curvature perturbations. The amplified perturbations can generate a sizable amount of primordial black holes (PBHs) and induce simultaneously a significant background gravitational waves (SIGWs). In this paper, we investigate the primordial non-Gaussianity of the curvature perturbations in the inflation with gravitationally enhanced friction. We find that when the gravitationally enhanced friction plays a role in the inflationary dynamics, the non-Gaussianity is noticeably larger than that from the standard slow-roll inflation. During the regime in which the power spectrum of the curvature perturbations is around its peak, the non-Gaussianity parameter changes from negative to positive. When the power spectrum is at its maximum, the non-Gaussianity parameter is near zero ($\sim \mathcal{O}(0.01)$). Furthermore, the primordial non-Gaussianity promotes the formation of PBHs, while its effect on SIGWs is negligible.

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Cited by 2 Pith papers

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  1. Isotropic background and anisotropies of gravitational waves induced by cosmological soliton isocurvature perturbations

    astro-ph.CO 2025-01 conditional novelty 6.0 of 10

    Soliton isocurvature perturbations produce gravitational waves whose sky anisotropies are enhanced by non-Gaussianity, offering a new probe of the early universe.

  2. Primordial Black Hole Formation from the Upward Step Model: Avoiding Overproduction

    astro-ph.CO 2024-12 conditional novelty 5.0 of 10

    In upward-step inflation, a non-Gaussian cutoff in curvature perturbations sharply suppresses type-I primordial black hole abundance for h above about 5.9, easing PTA overproduction constraints.

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